Heat-insulating material.



106. COMPOSITIONS,

COATING R PLASTIC.

HENRY BUTTEBMANN, JR., AND GARRY G. BUTTERMANN, 0F LOUISVILLE, KENTUCKY.

HEAT-INSULATING MATERIAL.

No Drawing.

,- a composition of matter composed of coal dust, sand, Wt, gypsum and blue clay, toget er W1 a sufficient supply of water to set the same.

According to our invention we take about 40% by measure of coal dust by measure of sand, 15% y measure of Portland cement 10% by measure of owdered sum and 10% by measure of Elue cla d lils lati er is mixed with sufiicien wa er 0 form 25 a thin solution and is then added to the other ingredients, and the whole mass is thoroughly mixed and is poured into suitable molds and allowed to set, and is then dried to form slabs which may be of any size or thickness, and may be used to line the walls of cold storage plants.

Instead of manufacturing the same in copies of this patent may be obtained for five cents each, by addressing the "commissioner of Patents,

Patented Apr. 23, 1918.

slabs, the composition, while still in the plastic state, may be poured or rammed to form the lining of a hollow refrigerator, ice cream freezer, or the like, where it is gllowed to set and becomes more or less ry.

We have found the composition of matter especially eflicient as a filler between the walls of ice boxes and ice cream cabinets, or refrigerators, where it is desired to retain the contents of the package in a cold or refrigerated condition.

The proportions of the ingredients may be somewhat varied if desired.

Having thus described our invention what we claim and desire to secure by Letters Patent of the United States is:

1. A heat insulating material composed of coal dust, sand, Portland cement, gypsum, blue clay and water, substantially as described.

2. A heat insulating material consisting of thefollowing materials in substantially the proportions by measure herein stated coal dust 40%, sand 25 Portland cement 15%, gypsum 10% and blue clay 10%, mixed with suflicient water to cause the material to set, substantially as described.

In testimony whereof, we aflix our signatures.

HENRY BUTTERMANN, JR. GARRY G. BUTTERMANN.

Washington, D. 0. 

